Matsya Purana — Origin of Soma
शान्तिकृच् छान्तमनसस् तदन्तर्नयने स्थितम् माहात्म्यात्तपसा विप्राः परमानन्दकारकम् //
śāntikṛc chāntamanasas tadantarnayane sthitam māhātmyāttapasā viprāḥ paramānandakārakam //
O brāhmaṇas, through the greatness of austerity (tapas), that which brings peace—abiding in the inner vision of the tranquil-minded—becomes the cause of supreme bliss.
This verse does not describe pralaya directly; it emphasizes an inner, psychological-spiritual result—peace and supreme bliss—attained through tapas and steady inner vision.
It frames self-discipline as foundational dharma: a king or householder who cultivates śānti (calm mind) through regulated practice and restraint gains clarity in judgment and ethical steadiness, which the Purāṇas treat as essential for righteous governance and household conduct.
No direct Vāstu or iconographic rule is stated; ritually, the verse supports tapas and inward contemplation (antar-nayana) as the inner purpose behind vows, fasts, and purificatory observances.